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I know
jQuery.
Now what?
Remy Sharp • @rem
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7 years ago...
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7 years ago...
Actually,
me 7 years ago...
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$ =
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Ajax Grokage
Ajax + me
WAT?
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function getXmlHttpRequest() {
var xhr;
if (window.XMLHttpRequest) {
xhr = new XMLHttpRequest();
} else {
try {
xhr = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
xhr = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {
xhr = false;
}
}
}
return xhr;
}
// disclaimer: John's jQuery version is a lot more elegant!
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Back to the Future
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querySelectorAll
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var $ = document.querySelectorAll.bind(document);
Element.prototype.on = Element.prototype.addEventListener;
$('#somelink')[0].on('touchstart', handleTouch);
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When I use jQuery
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No mustard
cu ing:
I include
jQuery.
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if (querySelector in document &&
localStorage in window &&
addEventListener in window) {
// bootstrap the JavaScript app
}
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Quick 'n Dirty
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Sans jQuery
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document.ready
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.attr()
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$('input').on('change', function () {
var value = $(this).attr('value');
alert('The new value is' + value);
});
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$('input').on('change', function () {
var value = this.value;
alert('The new value is' + value);
});
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$('a').attr('href')
a.getAttribute('href')
a.href
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$('body').addClass('hasJS');
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document.body.className = 'hasJS';
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Classy
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body.className += ' hasJS'
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body.classList.add('hasJS')
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body.classList.remove('hasJS')
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body.classList.toggle('hasJS')
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body.classList.add('foo', 'bar')
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body.classList.contains('');
// SyntaxError: DOM Exception 12
:(
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data
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el.dataset.user = JSON.stringify(user);
el.dataset.score = score;
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ax
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function request(type, url, opts, callback) {
var xhr = new XMLHttpRequest();
if (typeof opts === 'function') {
callback = opts;
opts = null;
}
xhr.open(type, url);
// serialise post data
if (type === 'POST' && opts) {
//
}
xhr.onload = function () { callback(JSON.parse(xhr.response)); };
xhr.send(opts ? fd : null);
}
var get = request.bind(this, 'GET');
var post = request.bind(this, 'POST');
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function request(type, url, opts, callback) {
var xhr = new XMLHttpRequest();
if (typeof opts === 'function') {
callback = opts;
opts = null;
}
xhr.open(type, url);
// serialise post data
if (type === 'POST' && opts) {
//
}
xhr.onload = function () { callback(JSON.parse(xhr.response)); };
xhr.send(opts ? fd : null);
}
var get = request.bind(this, 'GET');
var post = request.bind(this, 'POST');
xhr.onload = function () { callback(JSON.parse(xhr.response)); };
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function request(type, url, opts, callback) {
var xhr = new XMLHttpRequest();
if (typeof opts === 'function') {
callback = opts;
opts = null;
}
xhr.open(type, url);
// serialise post data
if (type === 'POST' && opts) {
//
}
xhr.onload = function () { callback(JSON.parse(xhr.response)); };
xhr.send(opts ? fd : null);
}
var get = request.bind(this, 'GET');
var post = request.bind(this, 'POST');
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•CORS
•Progress events
•Upload progress events
•Different posting types
•Using FormData
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fffffffffforms!
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Style & animation
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CSS > JS
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CSS > JS
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CSS > JS
(for CSS, duh)
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Ss
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Bad: .css
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Good: .addClass
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Gooderer: .className
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If it's native to the
browser, let the
browser get on
with it's job.
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Animation
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setInterval
VS.
requestAnimationFrame
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setInterval requestAnimationFrame
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No content
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rAF > setInterval
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CSS animations
also uses
rAF scheduling
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Translate =
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el.on("webkitTransitionEnd", ended);
el.on("transitionend", ended);
Note the the lowercase 'e' on 'end'...
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And yes, there
are plugins.
1. jQuery-Animate-Enhanced
2. jQuery.Transit
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jQuery plugin.
Just because.
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$.fn.fitText = function( kompressor, options ) {
// Setup options
var compressor = kompressor || 1,
settings = $.extend({
'minFontSize' : Number.NEGATIVE_INFINITY,
'maxFontSize' : Number.POSITIVE_INFINITY
}, options);
return this.each(function(){
// Store the object
var $this = $(this);
// Resizer() resizes items based on the object width divided by the compressor * 10
var resizer = function () {
$this.css('font-size', Math.max(Math.min($this.width() / (compressor*10),
parseFloat(settings.maxFontSize)), parseFloat(settings.minFontSize)));
};
// Call once to set.
resizer();
// Call on resize. Opera debounces their resize by default.
$(window).on('resize orientationchange', resizer);
});
};
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$.fn.fitText = function( kompressor, options ) {
// Setup options
var compressor = kompressor || 1,
settings = $.extend({
'minFontSize' : Number.NEGATIVE_INFINITY,
'maxFontSize' : Number.POSITIVE_INFINITY
}, options);
return this.each(function(){
// Store the object
var $this = $(this);
// Resizer() resizes items based on the object width divided by the compressor * 10
var resizer = function () {
$this.css('font-size', Math.max(Math.min($this.width() / (compressor*10),
parseFloat(settings.maxFontSize)), parseFloat(settings.minFontSize)));
};
// Call once to set.
resizer();
// Call on resize. Opera debounces their resize by default.
$(window).on('resize orientationchange', resizer);
});
};
1. extend
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$.fn.fitText = function( kompressor, options ) {
// Setup options
var compressor = kompressor || 1,
settings = $.extend({
'minFontSize' : Number.NEGATIVE_INFINITY,
'maxFontSize' : Number.POSITIVE_INFINITY
}, options);
return this.each(function(){
// Store the object
var $this = $(this);
// Resizer() resizes items based on the object width divided by the compressor * 10
var resizer = function () {
$this.css('font-size', Math.max(Math.min($this.width() / (compressor*10),
parseFloat(settings.maxFontSize)), parseFloat(settings.minFontSize)));
};
// Call once to set.
resizer();
// Call on resize. Opera debounces their resize by default.
$(window).on('resize orientationchange', resizer);
});
};
1. extend
2. each
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$.fn.fitText = function( kompressor, options ) {
// Setup options
var compressor = kompressor || 1,
settings = $.extend({
'minFontSize' : Number.NEGATIVE_INFINITY,
'maxFontSize' : Number.POSITIVE_INFINITY
}, options);
return this.each(function(){
// Store the object
var $this = $(this);
// Resizer() resizes items based on the object width divided by the compressor * 10
var resizer = function () {
$this.css('font-size', Math.max(Math.min($this.width() / (compressor*10),
parseFloat(settings.maxFontSize)), parseFloat(settings.minFontSize)));
};
// Call once to set.
resizer();
// Call on resize. Opera debounces their resize by default.
$(window).on('resize orientationchange', resizer);
});
};
1. extend
2. each
3. width
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$.fn.fitText = function( kompressor, options ) {
// Setup options
var compressor = kompressor || 1,
settings = $.extend({
'minFontSize' : Number.NEGATIVE_INFINITY,
'maxFontSize' : Number.POSITIVE_INFINITY
}, options);
return this.each(function(){
// Store the object
var $this = $(this);
// Resizer() resizes items based on the object width divided by the compressor * 10
var resizer = function () {
$this.css('font-size', Math.max(Math.min($this.width() / (compressor*10),
parseFloat(settings.maxFontSize)), parseFloat(settings.minFontSize)));
};
// Call once to set.
resizer();
// Call on resize. Opera debounces their resize by default.
$(window).on('resize orientationchange', resizer);
});
};
1. extend
2. each
3. width
4. css
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$.fn.fitText = function( kompressor, options ) {
// Setup options
var compressor = kompressor || 1,
settings = $.extend({
'minFontSize' : Number.NEGATIVE_INFINITY,
'maxFontSize' : Number.POSITIVE_INFINITY
}, options);
return this.each(function(){
// Store the object
var $this = $(this);
// Resizer() resizes items based on the object width divided by the compressor * 10
var resizer = function () {
$this.css('font-size', Math.max(Math.min($this.width() / (compressor*10),
parseFloat(settings.maxFontSize)), parseFloat(settings.minFontSize)));
};
// Call once to set.
resizer();
// Call on resize. Opera debounces their resize by default.
$(window).on('resize orientationchange', resizer);
});
};
1. extend
2. each
3. width
4. css
5. on
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if (options === undefined) {
options = {};
}
if (options.minFontSize === undefined) {
options.minFontSize = Number.NEGATIVE_INFINITY;
}
if (options.maxFontSize === undefined) {
options.maxFontSize = Number.POSITIVE_INFINITY;
}
.extend becomes init default options
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// assuming polyfill or IE9+
nodes.forEach(function (node) {
// where we used `this`, we now use `node`
// ...
})
.each becomes regular loop
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var resizer = function () {
var width = node.clientWidth;
// ...
};
.width becomes .clientWidth property
Note: clientWidth != .width() - but will do for our solution
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node.style.fontSize = Math.max(...);
.css becomes se ing style property
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// assuming polyfill or IE9+
window.addEventListener('resize', resizer, false);
.on becomes .addEventLister
Polyfill: h ps://gist.github.com/eirikbacker/2864711
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Idea:
Why not use PE to
support jQuery?
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Recap
querySelectorAll for DOM
navigation
Think about when to use
jQuery / a library
Ditch document.ready
Use this.value
Try .classList
Really grok ajax
No more JavaScript
animations
Maybe no-jQuery first?
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Your turn.